摘要： 基于有限元软件SYSWELD对海上油气平台、液化石油气模块化工厂(LNG)等结构钢CO2焊的温度场进行三维动态模拟,结合工程实际焊接工艺参数,采用热循环曲线法作为加载热源对焊缝进行加热,利用现场实测跟踪数据对热源进行校准,得出了瞬态80℃以上区域温度场分布范围。利用模拟数据绘制待焊接区防火涂料预留图指导防火涂料预留定位施工,结果表明:模拟温度场可以较好地预测焊接热影响区温度分布,为实现防火涂料焊接回切及预留范围确定和定位施工等提供了理论基础。

关键词: 防火涂料; 焊接回切; 焊接预留; SYSWELD; 数值模拟

Abstract: Based on the finite element software SYSW ELD, the temperature field in alloy structural steel of offshore platform and liquefied natural gas(ING )modular plant, etc. by using CO, welding was simulated by three-dimensional dynamic simulation. Combined with the engineering practical welding process parameters, the heat source was modified by using thermal cycling curve as an add-weld. The temperature field distribution of above 80 C temperature was obtained by using the field test data to calibrate the heat source. The passive fireproof-ing paint (PFP)area welding exposed drawings for guiding exposing application were drawn by using simulated data. The results showed that the simulated temperature field could better predict the temperature distribution of the welding heat affected zone, which provided a theo-retical basis for the determination of the scope and the location of the PFP exposing.

Key words: fireproof paint; weld cutback; allowance for welding; SYSWELD;numerical simulation